一句命令完成数据库的安装

环境：centos7，可以连接外网
一、安装MariaDB
命令：yum install mariadb mariadb-server -y

[root@chensy ~]# yum install mariadb mariadb-server -y
Loaded plugins: fastestmirror
Repository base is listed more than once in the configuration
Loading mirror speeds from cached hostfile
base                                                    | 3.6 kB     00:00
extras                                                  | 2.9 kB     00:00
updates                                                 | 2.9 kB     00:00
Resolving Dependencies
--> Running transaction check
...
Installed:mariadb.x86_64 1:5.5.68-1.el7      mariadb-server.x86_64 1:5.5.68-1.el7Dependency Installed:libaio.x86_64 0:0.3.109-13.el7perl-Compress-Raw-Bzip2.x86_64 0:2.061-3.el7perl-Compress-Raw-Zlib.x86_64 1:2.061-4.el7perl-DBD-MySQL.x86_64 0:4.023-6.el7perl-DBI.x86_64 0:1.627-4.el7perl-Data-Dumper.x86_64 0:2.145-3.el7perl-IO-Compress.noarch 0:2.061-2.el7perl-Net-Daemon.noarch 0:0.48-5.el7perl-PlRPC.noarch 0:0.2020-14.el7Dependency Updated:mariadb-libs.x86_64 1:5.5.68-1.el7Complete!

二、启动数据库

[root@chensy ~]# systemctl start mariadb
[root@chensy ~]# systemctl  enable mariadb 开机自启动
Created symlink from /etc/systemd/system/multi-user.target.wants/mariadb.service to /usr/lib/systemd/system/mariadb.service.

三、初始化数据库
命令：mysql_secure_installation

[root@chensy ~]# mysql_secure_installationNOTE: RUNNING ALL PARTS OF THIS SCRIPT IS RECOMMENDED FOR ALL MariaDBSERVERS IN PRODUCTION USE!  PLEASE READ EACH STEP CAREFULLY!In order to log into MariaDB to secure it, we'll need the current
password for the root user.  If you've just installed MariaDB, and
you haven't set the root password yet, the password will be blank,
so you should just press enter here.Enter current password for root (enter for none): （没设置过密码直接回车）
OK, successfully used password, moving on...Setting the root password ensures that nobody can log into the MariaDB
root user without the proper authorisation.Set root password? [Y/n] y  （设置root密码）
New password:
Re-enter new password:       （重新输入一次密码）
Password updated successfully!
Reloading privilege tables..... Success!By default, a MariaDB installation has an anonymous user, allowing anyone
to log into MariaDB without having to have a user account created for
them.  This is intended only for testing, and to make the installation
go a bit smoother.  You should remove them before moving into a
production environment.Remove anonymous users? [Y/n] y    （删除匿名用户）... Success!Normally, root should only be allowed to connect from 'localhost'.  This
ensures that someone cannot guess at the root password from the network.Disallow root login remotely? [Y/n] n  （是否允许root远程登陆）... skipping.By default, MariaDB comes with a database named 'test' that anyone can
access.  This is also intended only for testing, and should be removed
before moving into a production environment.Remove test database and access to it? [Y/n] y （删除测试数据库）- Dropping test database...... Success!- Removing privileges on test database...... Success!Reloading the privilege tables will ensure that all changes made so far
will take effect immediately.Reload privilege tables now? [Y/n] y （重新加载权限表）... Success!Cleaning up...All done!  If you've completed all of the above steps, your MariaDB
installation should now be secure.Thanks for using MariaDB!

四、登录数据库

[root@chensy ~]# mysql -u root -p
Enter password:
Welcome to the MariaDB monitor.  Commands end with ; or \g.
Your MariaDB connection id is 9
Server version: 5.5.68-MariaDB MariaDB ServerCopyright (c) 2000, 2018, Oracle, MariaDB Corporation Ab and others.Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.MariaDB [(none)]>